沥青 -炉渣界面黏附性与体系水稳性关系研究

Study on the Relationship Between Adhesion of Asphalt-bottom Ash Interface and Water Stability of the System

为探究炉渣与沥青之间的界面黏附性对沥青混合料水稳定性能的影响,采用两种粒径的炉渣作为集料,以石灰岩为对照组,对多种沥青和不同集料进行了接触角测试。根据表面自由能理论,计算了各组分表面能参数(黏附功、剥落功),以评价其黏附性及抗水损害性能,通过比较计算结果探究炉渣粒径对体系的影响。研究结果表明,炉渣与沥青能够自发黏结,但水的存在会导致炉渣与沥青剥离。不同粒径的炉渣与沥青之间存在明显的黏附性差异,细炉渣与沥青之间的黏附功最大,同时剥落功最小。这表明,采用小粒径炉渣作为集料可以提高混合料的整体抗水损害性能。通过对比水煮法与当前试验的结果,验证了本研究方法的可靠性。研究结果不仅验证了沥青-炉渣间黏附性与炉渣沥青混合料水稳定性之间的关联,同时为炉渣沥青混合料水稳定性提供了一种量化测试方法,具有理论和实际应用价值。

In order to investigate the relationship between the interfacial adhesion between bottom ash-asphalt and the water stability property of asphalt mixtures,two types of asphalt were selected and two particle sizes of bottom ash were used as aggregates.According to the surface free energy theory,the surface energy parameters(work of adhesion,work of debonding)of each component were calculated to evaluate the adhesion and water damage resistance.The effect of bottom ash particle size on the system was investigated by comparison.The results show that the bottom ash can bond spontaneously to the asphalt,but the presence of water leads to peeling of the bottom ash from the asphalt.The adhesion between bottom ash with different particle size and asphalt was different significantly.Fine bottom ash had the highest work of adhesion and the lowest work of debonding with asphalt,indicating that the use of small particle size bottom ash as an aggregate has an improved effect on the overall water damage resistance of the mixture.The results of the boiling method illustrated the reliability of this study.The study verifies the correlation between bottom ash-asphalt adhesion and the water stability of asphalt mixes with bottom ash.And it also provides a quantitative test method for the water stability of asphalt mixes with bottom ash.